JP3631635B2 - Terminal for storage battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage battery terminal used in a storage battery such as a lithium ion battery.
[0002]
[Prior art]
Conventionally, as shown in a cross-sectional view in FIG. 3, the storage battery terminal has a substantially circular shape made of a highly conductive material such as aluminum, aluminum alloy, copper, or copper alloy inside a substantially cylindrical insulating base 21 made of alumina ceramics. The columnar terminal column 22 is inserted and fixed so that both ends thereof protrude from the insulating base 21, and an annular shape made of a highly conductive material such as aluminum, aluminum alloy, copper, or copper alloy is provided on the outer peripheral portion of the insulating base 21. The flange 23 is fixed.
[0003]
And the one electrode plate group E of a storage battery is connected to the lower end part of the terminal pillar 22, and it functions as one terminal of a storage battery by joining the flange 23 to the container lid L of a storage battery by welding.
[0004]
The terminal columns 22 and the flanges 23 are fixed to the insulating base 21 by depositing metallized layers 24 and 25 made of, for example, molybdenum-manganese on a part of the inner peripheral surface and a part of the outer peripheral surface of the insulating base 21, respectively. At the same time, the metallized layer 24 and the terminal column 22 and the metallized layer 25 and the flange 23 are brazed through brazing materials 26 and 27 such as aluminum brazing and silver brazing, respectively.
[0005]
[Problems to be solved by the invention]
However, according to this conventional storage battery terminal, the thermal expansion coefficient of the alumina ceramic constituting the insulating base 21 is about 7 × 10 ⁻⁶ / ° C. (20 to 800 ° C.), whereas the terminal column 22 and the flange The thermal expansion coefficient of aluminum, aluminum alloy / copper / copper alloy, etc. that constitutes No. 23 is about 20 × 10 ⁻⁶ to 30 × 10 ⁻⁶ / ° C. (20 to 800 ° C.). Therefore, when the insulating base 21, the terminal column 22 and the flange 23 are brazed at a high temperature via a brazing material 26/27 such as aluminum brazing or silver brazing and cooled to room temperature, the terminal column 22 and the flange are separated. 23 tends to heat shrink much more than the insulating base 21, so that tensile stress is applied to the inner peripheral surface side of the insulating base 21 by the terminal columns 22, and The side so that the compressive stress is applied by the flanges 23. At this time, ceramics has a robust property against compressive stress, but has a relatively weak property against tensile stress. Thus, tensile stress applied to the inner peripheral surface side of the insulating substrate is thus obtained. Therefore, there is a problem that a crack may occur in the insulating base 21.
[0006]
The present invention has been devised in view of the above-described problems, and its purpose is to provide a storage battery terminal capable of firmly bonding an insulating substrate and a terminal column without generating cracks in the insulating substrate. Is to provide.
[0007]
[Means for Solving the Problems]
The storage battery terminal of the present invention according to claim 1 is a storage battery terminal that is inserted into a cylindrical insulating base made of ceramics and brazed, and is made of aluminum / aluminum. A cylindrical member made of one of an alloy, copper, and a copper alloy, and a rod-shaped stress relaxation member that is loaded inside the cylindrical member and has a smaller thermal expansion coefficient than the cylindrical member. Is.
[0008]
Further, the storage battery terminal of the present invention according to claim 2 is a storage battery terminal formed by inserting and brazing a terminal column inside a cylindrical insulating base made of ceramics, wherein the terminal column is made of aluminum. A cylindrical member made of one of aluminum alloy, copper, and copper alloy, a cylindrical stress relaxation member that is loaded inside the cylindrical member and has a smaller thermal expansion coefficient than the cylindrical member, and the stress relaxation It is characterized by comprising a rod-shaped core member that is loaded inside the member and has a higher conductivity than the stress relaxation member.
[0009]
According to the storage battery terminal of the present invention according to claim 1, the terminal member brazed to the inside of the insulating base is a cylindrical member made of one of aluminum, aluminum alloy, copper, and copper alloy, and the cylindrical member. Since it is composed of a rod-shaped stress relaxation member that is loaded inside the member and has a thermal expansion coefficient smaller than that of the cylindrical member, when cooling the insulating base and the terminal column from high temperature to room temperature Even if the cylindrical member tries to heat shrink much more than the insulating substrate, the thermal shrinkage is greatly reduced by the stress relaxation member loaded inside the cylindrical member, and as a result, a large tensile stress is applied to the inner peripheral surface side of the insulating substrate. Can be effectively prevented from being applied.
[0010]
According to the storage battery terminal of the present invention according to claim 2, the terminal member brazed to the inside of the insulating base is a cylindrical member made of one of aluminum, aluminum alloy, copper, and copper alloy, and A cylindrical stress relaxation member that is loaded inside the cylindrical member and has a thermal expansion coefficient smaller than that of the cylindrical member, and a conductive material that is loaded inside the stress relaxation member and has a conductivity higher than that of the stress relaxation member. Therefore, even when the tubular member attempts to heat shrink much more than the insulating substrate when it is cooled from the high temperature brazing the insulating substrate and the terminal column to room temperature, the thermal contraction is It is greatly reduced by the stress relaxation member loaded inside the cylindrical member, and as a result, it is possible to effectively prevent a large tensile stress from being applied to the inner peripheral surface side of the insulating base and to relieve the stress. It can have high conductivity of the terminal post by a core member loaded in the interior of the wood.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, the storage battery terminal of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 1 is a sectional view showing an example of an embodiment of a storage battery terminal according to the first aspect of the present invention. In FIG. 1, 1 is an insulating substrate, 2 is a terminal column, and 3 is a flange.
[0013]
The insulating base 1 is a substantially cylindrical body made of alumina ceramics, for example, and electrically insulates and holds the terminal columns 2 and the flanges 3. A rod-like terminal column 2 is inserted and fixed inside thereof, and an annular flange 3 is fixed to the outer peripheral surface thereof.
[0014]
If the insulating substrate 1 is made of, for example, alumina ceramics, the raw material powder prepared by adding an appropriate organic binder to the raw material powder such as aluminum oxide, silicon oxide, calcium oxide, and magnesium oxide is placed in a press die having a predetermined shape. And is molded by pressing it at a predetermined pressure, and then the obtained molded body is fired at a temperature of about 1600 ° C. in the atmosphere.
[0015]
Further, the insulating base 1 is formed with a chamfered portion C between its inner peripheral surface and both end surfaces. An annular metallized layer 4 is deposited on the inner peripheral surface in the vicinity of both end faces from the chamfered portion C.
[0016]
The metallized layer 4 is made of, for example, molybdenum-manganese metallized, and functions as a base metal for fixing the terminal column 2 inserted inside the insulating base 1 to the insulating base 1. The terminal columns 2 are joined to the metallized layer 4 via a brazing material 6 such as aluminum brazing or silver brazing.
[0017]
Further, a metallized layer 5 is formed on a part of the outer peripheral surface of the insulating substrate 1 so as to cover the entire periphery. The metallized layer 5 is made of molybdenum-manganese metallized similarly to the metallized layer 4 and functions as a base metal for fixing the flange 3 to the insulating substrate 1. The flange 3 is joined to the metallized layer 5 via a brazing material 7 such as aluminum brazing or silver brazing.
[0018]
If the metallized layers 4 and 5 are made of, for example, molybdenum-manganese metallized, the insulating substrate 1 is chamfered with a metal paste obtained by adding and mixing an appropriate organic binder and solvent to molybdenum powder, manganese powder, and oxide powder. The chamfered portion C and both ends of the insulating substrate 1 are printed by printing the portion C and the inner peripheral surface in the vicinity of both end surfaces, and a part of the outer peripheral surface by a screen printing method, and baking this at a temperature of about 1400 ° C. A ring is deposited on the inner peripheral surface and a part of the outer peripheral surface in the vicinity of the surface.
[0019]
In order to join the terminal pillar 2 and the flange 3 to the metallized layers 4 and 5 via the brazing material 6 and 7, respectively, if the brazing material 6 and 7 are made of aluminum brazing, for example, the terminal pillar 2 Is inserted into the inside of the insulating base 1 so that both ends thereof protrude, and the insulating base 1 is inserted into the inside of the flange 3, and then the wire-like aluminum brazing material is placed on the metallized layers 4 and 5, respectively. The metallized layers 4 and 5 and the terminal pillars 2 and flanges are disposed over substantially the entire inner and outer circumferences of the insulating base 1 and heated in a vacuum atmosphere at a temperature of about 600 ° C. to melt the aluminum brazing material. 3 is used.
[0020]
The surface of the metallized layers 4 and 5 is excellent in corrosion resistance such as nickel and the brazing material 6 in order to prevent oxidative corrosion of the metallized layers 4 and 5 and improve wettability with the brazing materials 6 and 7. -It is preferable to deposit a metal excellent in wettability with 7 to a thickness of about 1 to 10 μm.
[0021]
A terminal column 2 inserted and fixed inside the insulating base 1 is a bottomed substantially cylindrical cylindrical member 2a made of aluminum, aluminum alloy, copper, or copper alloy, and an inner side of the cylindrical member 2a. Are joined to the metallized layer 4 with a brazing material 6 such as aluminum brazing or silver brazing in a state in which both end portions thereof are projected from the insulating base 1. Has been. And it connects as the electrode plate group E of a storage battery to the lower end side, and functions as a terminal part for connecting the electrode plate group E to the exterior.
[0022]
The cylindrical member 2a constituting the terminal column 2 functions as a main conductive path for taking charge into and out of the electrode plate group E and provides a bonding surface for bonding the terminal column 2 to the insulating substrate 1. Since it is made of aluminum or an aluminum alloy / copper / copper alloy, it is excellent in electrical conductivity and excellent in bondability with a brazing material 6 such as aluminum brazing or silver brazing.
[0023]
In addition, when the stress relieving member 2b loaded inside the cylindrical member 2a is cooled from the brazing temperature to room temperature when the terminal column 2 is brazed to the insulating base 1, aluminum, aluminum alloy, copper The tubular member 2a made of a copper alloy has a function of effectively preventing a large tensile stress from being applied to the inner peripheral surface side of the insulating substrate 1 due to the thermal contraction of the cylindrical member 2a much larger than that of the insulating substrate 1, and its thermal expansion. It is made of a material whose coefficient is smaller than the thermal expansion coefficient of the cylindrical member 2a, specifically, alumina ceramics, silicon nitride ceramics, niobium, tungsten, molybdenum, iron-nickel-cobalt alloy, iron-nickel alloy, or the like.
[0024]
Since the thermal expansion coefficient of the stress relaxation member 2b is smaller than the thermal expansion coefficient of the cylindrical member 2b, when the terminal column 2 is brazed to the insulating base 1, the temperature from the brazing temperature to the normal temperature. The amount of thermal shrinkage is smaller than that of the cylindrical member 2a when cooled to a low level. Therefore, even when the cylindrical member 2a is subjected to heat contraction much larger than the insulating base 1 when the terminal column 2 is brazed to the insulating base 1, the thermal contraction is caused by the stress relaxation member 2b loaded inside the cylindrical member 2a. As a result, it is possible to effectively prevent a large tensile stress from being applied to the inner peripheral surface side of the insulating substrate 1 to which the terminal column 2 is brazed, and to insulate the insulating substrate 1 and the terminal column 2 from each other. It is possible to firmly bond the base 1 without causing cracks.
[0025]
The thermal expansion coefficient of the stress relaxation member 2b is preferably in the range of 3 × 10 ⁻⁶ to 10 × 10 ⁻⁶ / ° C. (20 to 800 ° C.). When the thermal expansion coefficient of the stress relaxation member 2b is less than 3 × 10 ⁻⁶ / ° C., it tends to be difficult to find a suitable material for the stress relaxation member 2b. On the other hand, when it exceeds 10 × 10 ⁻⁶ / ° C., it is possible to effectively reduce the thermal contraction of the cylindrical member 2 a much larger than that of the insulating substrate 1 when the terminal column 2 is brazed to the insulating substrate 1. Therefore, the insulating substrate 1 tends to be easily cracked.
[0026]
The ratio of the diameter of the stress relaxation member 2b to the thickness of the cylindrical member 2a is preferably in the range of 1: 2 to 1: 5. When the ratio of the diameter of the stress relaxation member 2b to the thickness of the tubular member 2a is less than 1: 2, the tubular member 2a is much larger than the insulating substrate 1 when the terminal column 2 is brazed to the insulating substrate 1. The shrinkage cannot be effectively reduced by the stress relaxation member 2b, and the insulating substrate 1 tends to be easily cracked. On the other hand, if the ratio exceeds 1: 5, the electrical resistance of the terminal column 2 becomes high, and it is difficult to satisfactorily put in and out charges to the electrode plate group E when the current flowing through the terminal column 2 becomes a large current. It tends to be.
[0027]
The stress relaxation member 2b is loaded into the cylindrical member 2a by brazing, press-fitting, casting, thermal spraying, or the like. For example, the stress relaxation member 2b is made of alumina ceramic, and this is brazed to the cylindrical member 2a. In the case of loading, for example, a metallized layer made of molybdenum-manganese whose surface is plated with nickel is deposited on the outer peripheral surface of the stress relaxing member 2b made of alumina ceramic, and the stress relaxing member 2b is formed into a cylinder. A method of inserting the metallized layer and the inner peripheral surface of the cylindrical member 2a through a brazing material such as an aluminum brazing or a silver brazing while being inserted into the inside of the shaped member 2a is employed.
[0028]
On the other hand, the flange 3 fixed to the outer peripheral surface of the insulating substrate 1 is a torus made of aluminum, aluminum alloy, copper, copper alloy, iron-nickel alloy, iron-nickel-cobalt alloy, etc. They are joined via a brazing material 7 such as aluminum brazing or silver brazing. And the terminal of this invention is fixed to the container of a storage battery by welding this flange 3 to the container lid L of a storage battery.
[0029]
Since the flange 3 mainly applies compressive stress to the insulating base 1 during brazing, cracks are generated in the insulating base 1 made of alumina ceramics having a robust property against compressive stress. There is nothing.
[0030]
Thus, according to the storage battery terminal of the present invention according to claim 1 described above, it is possible for the storage battery to always firmly bond the insulating base 1 and the terminal column 2 without generating cracks in the insulating base 1. A terminal can be provided.
[0031]
Next, an example of an embodiment of the storage battery terminal of the present invention according to claim 2 is shown in a sectional view in FIG. In FIG. 2, 1 is an insulating substrate, 12 is a terminal column, and 3 is a flange.
[0032]
The insulating base 1 and the flange 3 in this example are substantially the same as the insulating base 1 and the flange 3 in the example shown in FIG. 1, and the same portions are denoted by the same reference numerals. The description of these will be omitted.
[0033]
The terminal column 12 in this example is a bottomed substantially cylindrical tubular member 12a made of aluminum, a kind of aluminum alloy, copper, or copper alloy, and a substantially cylindrical shape loaded inside the tubular member 12a. The stress relaxation member 12b and a cylindrical core member 12c loaded inside the stress relaxation member 12b are formed on the metallized layer 4 attached to the insulating base 1, such as aluminum brazing or silver brazing. It is joined via the brazing material 6.
[0034]
The cylindrical member 12a constituting the terminal column 12 functions as a main conductive path for taking charge into and out of the electrode plate group E and provides a bonding surface for bonding the terminal column 12 to the insulating substrate 1. Since it is made of aluminum, an aluminum alloy, copper, or a copper alloy, it has excellent electrical conductivity and is excellent in jointability with a brazing material 6 such as aluminum brazing or silver brazing.
[0035]
Further, the stress relaxation member 12b loaded inside the cylindrical member 12a is made of aluminum, aluminum alloy, or copper when cooled from the brazing temperature to room temperature when the terminal column 12 is brazed to the insulating substrate 1. The tubular member 12a made of a copper alloy has a function of effectively preventing large tensile stress from being applied to the inner peripheral surface side of the insulating base 1 by being extremely heat-shrinkable than the insulating base 1, and its thermal expansion. It is made of a material whose coefficient is smaller than the thermal expansion coefficient of the cylindrical member 12a, specifically, alumina ceramics, silicon nitride ceramics, niobium, tungsten, molybdenum, iron-nickel-cobalt alloy, iron-nickel alloy, or the like.
[0036]
Since the thermal expansion coefficient of the stress relaxation member 12b is smaller than the thermal expansion coefficient of the cylindrical member 12a, when the terminal column 12 is brazed to the insulating base 1, the temperature from the brazing temperature to the normal temperature. The amount of thermal contraction is smaller than that of the cylindrical member 12a when cooled to a low level. Therefore, even when the tubular member 12a is subjected to extremely large thermal contraction than the insulating base 1 when the terminal column 12 is brazed to the insulating base 1, the thermal contraction is caused by the stress relaxation member 12b loaded inside the cylindrical member 12b. As a result, it is possible to effectively prevent a large tensile stress from being applied to the inner peripheral surface side of the insulating substrate 1 to which the terminal column 12 is brazed, and to insulate the insulating substrate 1 and the terminal column 12 from each other. It is possible to firmly bond the base body 1 without generating cracks.
[0037]
The thermal expansion coefficient of the stress relaxation member 12b is preferably in the range of 3 × 10 ⁻⁶ to 10 × 10 ⁻⁶ / ° C. (20 to 800 ° C.). When the thermal expansion coefficient of the stress relaxation member 12b is less than 3 × 10 ⁻⁶ / ° C., it tends to be difficult to find a suitable material for the stress relaxation member 12b. On the other hand, when it exceeds 10 × 10 ⁻⁶ / ° C., it is possible to effectively reduce the thermal contraction of the cylindrical member 12 a much larger than that of the insulating substrate 1 when the terminal column 12 is brazed to the insulating substrate 1. Therefore, the insulating substrate 1 tends to be easily cracked.
[0038]
The ratio of the thickness of the stress relaxation member 12b to the thickness of the cylindrical member 12a is preferably in the range of 1: 2 to 1: 4. When the thickness ratio of the stress relaxation member 12b to the thickness of the tubular member 12a is less than 1: 2, the tubular member 12a is much larger than the insulating substrate 1 in heat shrinkage when the terminal column 12 is brazed to the insulating substrate 1. However, the stress relaxation member 12b cannot effectively reduce this, and the insulating substrate 1 tends to crack. On the other hand, when the ratio exceeds 1: 4, the electric resistance of the terminal column 12 becomes high, and it is difficult to satisfactorily put in and out charges to the electrode plate group E when the current flowing through the terminal column 12 becomes a large current. It tends to be.
[0039]
The stress relaxation member 12b is loaded into the cylindrical member 12a by brazing, press-fitting, casting, thermal spraying, etc., as in the example shown in FIG. 1, for example, the stress relaxation member 12b is made of alumina ceramics. If this is to be loaded into the cylindrical member 12a by brazing, the outer peripheral surface of the stress relaxation member 12b made of alumina ceramic is coated with a metallized layer made of molybdenum-manganese, for example, nickel-plated on the surface. The stress relaxation member 12b is inserted into the cylindrical member 12a and the metallized layer and the inner peripheral surface of the cylindrical member 12a are brazed via a brazing material such as aluminum brazing or silver brazing. The method is adopted.
[0040]
Furthermore, the core member 12c loaded inside the stress relaxation member 12b is for increasing the conductivity of the terminal column 12, and is a material having a conductivity higher than that of the stress relaxation member 12b, specifically, Is formed from one of aluminum, aluminum alloy, copper and copper alloy.
[0041]
The core member 12c is made of aluminum or aluminum alloy / copper / copper alloy which has excellent conductivity of about 0.3 to 0.5 μΩ ⁻¹ / cm. When using alumina ceramics or silicon nitride ceramics, which are insulators, or tungsten, molybdenum, niobium, iron-nickel-cobalt alloy, iron-nickel alloy, etc. whose conductivity is as low as 0.06 to 0.2 μΩ ^-1 / cm Even so, the core member 12c can increase the effective conductivity of the terminal column 12 so that charges can be taken into and out of the electrode plate group E very well.
[0042]
The ratio of the diameter of the core member 12c to the thickness of the stress relaxation member 12b is preferably in the range of 1: 2 to 1: 4. When the ratio of the diameter of the core member 12c to the thickness of the stress relaxation member 12b is less than 1: 2, it tends to be difficult to make the conductivity of the terminal column 12 sufficiently high by the core member 12c. On the other hand, when exceeding 1: 4, when the terminal column 12 is brazed to the insulating substrate 1, the stress relaxation member is caused by the thermal stress generated due to the difference in thermal expansion coefficient between the stress relaxation member 12b and the core member 12c. As a result, a crack is generated in 12b, and as a result, the stress relieving member 12b causes the cylindrical member 12a to thermally contract more greatly than the insulating base 1, and the stress relieving member 12b cannot effectively reduce the heat shrinkage. There is a tendency that cracks are likely to occur.
[0043]
The core member 12c is loaded into the stress relaxation member 12b by brazing, press-fitting, casting, thermal spraying, or the like. For example, if the stress relaxation member 12b is made of alumina ceramic and the core member 12c is loaded by brazing, the inner peripheral surface of the stress relaxation member 12b made of alumina ceramic, for example, is plated with nickel. The metallized layer made of molybdenum-manganese is applied, and the core member 12c is inserted into the stress relieving member 12b, and the metallized layer on the inner peripheral surface of the stress relieving member 12b and the core member 12c are bonded to aluminum brazing. A method of brazing using a brazing material such as silver brazing is adopted.
[0044]
Thus, according to the storage battery terminal of the present invention according to claim 2 described above, the insulating base 1 and the terminal column 12 can always be firmly joined without causing cracks in the insulating base 1, and the terminal It is possible to provide a storage battery terminal capable of satisfactorily putting in and taking out electric charges to and from the electrode plate group E with the column 12 having a high conductivity.
[0045]
In addition, this invention is not limited to the example of the above embodiment, A various change and improvement can be performed in the range which does not deviate from the summary of this invention.
[0046]
【The invention's effect】
According to the storage battery terminal of the present invention according to claim 1, the terminal member brazed to the inside of the insulating base is a cylindrical member made of one of aluminum, aluminum alloy, copper, and copper alloy, and the cylindrical member. Because it consists of a rod-shaped stress relaxation member that is loaded inside the member and has a smaller coefficient of thermal expansion than the cylindrical member, the cylindrical member is insulated when it is cooled from high temperature to brazing the insulating base and the terminal column. Even if the thermal contraction is larger than that of the base, the thermal contraction is greatly reduced by the stress relaxation member loaded inside the cylindrical member, so that a large tensile stress is applied to the inner peripheral surface side of the insulating base. As a result, the insulating substrate and the terminal column can always be firmly bonded without causing cracks in the insulating substrate.
[0047]
According to the storage battery terminal of the present invention according to claim 2, the terminal member brazed to the inside of the insulating base is a cylindrical member made of one of aluminum, aluminum alloy, copper, and copper alloy, and A cylindrical stress relaxation member that is loaded inside the cylindrical member and has a smaller thermal expansion coefficient than the cylindrical member, and a rod-shaped core member that is loaded inside the stress relaxation member and has a higher conductivity than the stress relaxation member. Therefore, even when the tubular member attempts to heat shrink more than the insulating substrate when the insulating substrate and the terminal pillar are cooled from the high temperature to the normal temperature, the thermal shrinkage is the stress loaded inside the tubular member. It is possible to effectively prevent a large tensile stress from being applied to the inner peripheral surface side of the insulating substrate by being greatly reduced by the relaxation member, and the conductivity of the electrode column by the core member loaded inside the stress relaxation member. As a result, it is possible to always firmly bond the insulating substrate and the terminal column without causing cracks in the insulating substrate and to increase the conductivity of the terminal column to the electrode plate group. It is possible to provide a storage battery terminal capable of satisfactorily taking in and out the electric charge.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of a storage battery terminal according to the present invention according to claim 1;
FIG. 2 is a cross-sectional view showing an example of an embodiment of a storage battery terminal of the present invention according to claim 2;
FIG. 3 is a cross-sectional view showing an example of a conventional storage battery terminal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Insulation base | substrate 2, 12 ... Terminal pillar 2a, 12a ... Cylindrical member 2b, 12b ... Stress relaxation member 12c ... Core member

Claims (2)

A terminal for a storage battery in which a terminal pillar is inserted and brazed inside a cylindrical insulating base made of ceramic, the terminal pillar being a cylinder made of one of aluminum, aluminum alloy, copper and copper alloy A storage battery terminal comprising: a cylindrical member; and a rod-shaped stress relieving member that is loaded inside the cylindrical member and has a smaller thermal expansion coefficient than the cylindrical member. A terminal for a storage battery in which a terminal pillar is inserted and brazed inside a cylindrical insulating base made of ceramic, the terminal pillar being a cylinder made of one of aluminum, aluminum alloy, copper and copper alloy A cylindrical member, a cylindrical stress relaxation member having a smaller coefficient of thermal expansion than that of the cylindrical member, and an inner surface of the stress relaxation member, and having a conductivity higher than that of the stress relaxation member. A storage battery terminal comprising a high rod-shaped core member.

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